On Fri, Jun 1, 2018 at 11:53 AM, Tom Lane <t...@sss.pgh.pa.us> wrote:

>
> I agree though that it seems strange to special-case SQLValueFunction
> rather than any-stable-expression.  As long as the evaluation happens
> at executor start (i.e. with the query's run-time snapshot) it should
> be reasonable to simplify any stable expression.
>
> It's worth questioning whether this is a bug fix or an improvement.
> If the latter, it probably ought to wait for v12.
>

If explaining the change requires reference to tokens from the source code,
rather than something an end user could understand, I'd argue it is a bug
fix rather than an improvement.

Cheers,

Jeff

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